Best Virtual Reality (VR) Headsets of 2024: A Comprehensive Guide

Virtual reality (VR) has transformed the way we engage with digital environments, providing immersive experiences that were once purely imaginative. The VR headset market is more dynamic and varied than ever, addressing a broad spectrum of uses from gaming and entertainment to education and professional applications.

In this detailed guide, we’ll introduce you to the top VR headsets of 2024, emphasizing their key features, performance, and unique advantages. We’ll explain the underlying technology of VR, compare different types of virtual reality vr headsets, and provide tips for choosing the ideal device for your needs. Join us as we explore into the advanced world of virtual reality and help you discover the headset that will transport you to new levels of immersive interaction.

Understanding VR Technology: How It Works

Virtual reality (VR) technology has rapidly evolved, transforming from a futuristic concept into a mainstream tool for entertainment, education, and professional use. Understanding how VR works is essential for appreciating its capabilities and selecting the right headset for your needs. Here’s a breakdown of the core components and principles behind VR technology:

Core Components of VR Technology

  1. Headset Display:
    • Screens: VR headsets typically use two small screens or a single split screen, one for each eye, to create a stereoscopic 3D effect. These screens are usually high-resolution OLED or LCD panels that provide clear, vibrant images.
    • Field of View (FOV): The FOV is crucial for immersion, with wider fields providing a more encompassing experience. Most modern VR headsets offer a FOV ranging from 90 to 120 degrees.
  2. Lenses:
    • VR headsets use specially designed lenses to focus and reshape the images from the screens, creating a sense of depth and scale. These lenses adjust the light to simulate a natural viewing experience, allowing users to feel immersed in the virtual environment.
  3. Tracking Systems:
    • Positional Tracking: Positional tracking systems use external sensors or internal cameras to monitor the user’s head and body movements within a 3D space, allowing for realistic movement within the virtual environment.
    • Rotational Tracking: Gyroscopes, accelerometers, and magnetometers within the headset track the orientation of the user’s head, ensuring that the virtual view changes naturally with head movements.
  4. Input Devices:
    • Controllers: Handheld controllers equipped with buttons, joysticks, and motion sensors enable users to interact with the virtual environment. These controllers are tracked in 3D space to provide precise control.
    • Hand Tracking: Some advanced VR systems offer hand tracking, which uses cameras and sensors to capture hand and finger movements, allowing for more natural interactions without controllers.
  5. Audio:
    • High-quality spatial audio is integral to the VR experience. Built-in headphones or external speakers provide 3D soundscapes that enhance immersion by accurately simulating the direction and distance of sounds within the virtual environment.

Principles of VR Technology

  1. Immersion:
    • Immersion is the sensation of being physically present in a non-physical world. VR achieves immersion through a combination of high-resolution displays, wide FOV, precise tracking, and spatial audio.
  2. Interaction:
    • Interaction in VR is facilitated by input devices and tracking systems that allow users to manipulate virtual objects, navigate environments, and engage with virtual characters as if they were real.
  3. Presence:
    • Presence is the feeling that you are inside the virtual environment. It is achieved when the VR system successfully integrates visual, auditory, and interactive elements to the point where the user’s brain accepts the virtual world as real.
  4. Latency:
    • Low latency is crucial for a comfortable VR experience. Latency refers to the time it takes for a user’s movement to be reflected in the virtual environment. High latency can cause motion sickness and disrupt immersion.

Understanding these core components and principles of VR technology will help you appreciate the complexities behind creating immersive virtual experiences. This knowledge also aids in making an informed decision when selecting a VR headset, ensuring you choose one that meets your expectations for performance and immersion.

Top VR Headsets of 2024: Our Recommendations

As virtual reality technology continues to advance, the selection of VR headsets available in 2024 is more impressive than ever. Whether you are looking for high-end performance, affordability, or a versatile experience, there is a VR headset to meet your needs. Here are our top recommendations for VR headsets in 2024:

1. Meta Quest 3

  • Features: Standalone VR headset with built-in sensors for inside-out tracking, no need for external sensors.
  • Display: High-resolution LCD with a refresh rate of up to 120Hz.
  • Performance: Powered by a custom Snapdragon XR2 processor, offering excellent graphics and smooth performance.
  • Pros: Wireless freedom, extensive content library, easy setup.
  • Cons: Limited battery life, less powerful than tethered PC VR systems.

2. Valve Index

  • Features: PC-tethered headset known for its high-quality visuals and precise tracking.
  • Display: Dual LCD screens with a combined resolution of 2880×1600 and a refresh rate of up to 144Hz.
  • Performance: Requires a powerful gaming PC, but delivers top-tier performance.
  • Pros: Superior tracking with external base stations, comfortable fit, excellent audio.
  • Cons: High price point, requires a VR-ready PC and external sensors.

3. Sony PlayStation VR2

  • Features: Designed specifically for PlayStation 5, offering exclusive VR titles.
  • Display: OLED screens with a resolution of 2000×2040 per eye and a refresh rate of up to 120Hz.
  • Performance: Leveraging the power of the PS5 for stunning graphics and fast load times.
  • Pros: Immersive experience with haptic feedback, eye tracking, and adaptive triggers.
  • Cons: Tethered to the PS5, limited to PlayStation’s VR ecosystem.

4. HP Reverb G2

  • Features: High-resolution headset suitable for both gaming and professional use.
  • Display: 2160×2160 per eye resolution with a 90Hz refresh rate.
  • Performance: Compatible with both SteamVR and Windows Mixed Reality platforms.
  • Pros: Excellent visual clarity, comfortable design, easy setup.
  • Cons: Moderate tracking issues in fast-paced games, tethered to a PC.

5. Pico Neo 3 Pro

  • Features: Standalone VR headset targeting enterprise and consumer markets.
  • Display: 3664×1920 resolution with a 90Hz refresh rate.
  • Performance: Powered by Qualcomm Snapdragon XR2, similar to Meta Quest 3.
  • Pros: Wireless use, enterprise-grade applications, good battery life.
  • Cons: Smaller content library compared to Oculus, higher cost for enterprise features.

6. HTC Vive Pro 2

  • Features: High-end VR headset aimed at enthusiasts and professionals.
  • Display: 5K resolution (2448×2448 per eye) with a 120Hz refresh rate.
  • Performance: Requires a high-performance PC, supports SteamVR and Viveport.
  • Pros: Exceptional display quality, comprehensive tracking with external sensors, modular design.
  • Cons: Expensive, setup complexity with external sensors.

7. Samsung Odyssey+

  • Features: Windows Mixed Reality headset with enhanced comfort and visuals.
  • Display: AMOLED screens with 2880×1600 resolution and anti-screen door effect technology.
  • Performance: Good performance with compatible Windows Mixed Reality PCs.
  • Pros: Affordable, easy setup, good visual clarity.
  • Cons: Tracking limitations, less premium build quality compared to higher-end models.

These top VR headsets of 2024 cater to a variety of needs and budgets, from standalone wireless solutions to high-end tethered systems for the ultimate immersive experience. Whether you’re a casual user, a hardcore gamer, or a professional, there’s a VR headset on this list that will enhance your virtual reality experiences.

Key Features to Look for in a VR Headset

When choosing a VR headset, it’s important to consider several key features that can significantly impact your virtual reality experience. Here are the essential features to look for:

1. Display Quality

  • Resolution: Higher resolution screens provide clearer and more detailed visuals, reducing the screen-door effect (visible lines between pixels).
  • Refresh Rate: A higher refresh rate (90Hz or more) ensures smoother motion and reduces motion sickness.
  • Field of View (FOV): A wider FOV (typically 100 degrees or more) enhances immersion by expanding the visible area.

2. Tracking System

  • Inside-Out Tracking: Uses cameras on the headset to track movement without external sensors, offering greater freedom of movement and easier setup.
  • Outside-In Tracking: Requires external sensors for precise tracking, often resulting in more accurate motion capture but with a more complex setup.

3. Comfort and Ergonomics

  • Weight: A lighter headset reduces strain during extended use.
  • Adjustability: Adjustable head straps and interpupillary distance (IPD) settings ensure a comfortable fit for different users.
  • Padding: Quality padding materials enhance comfort, especially around the face and ears.

4. Audio Quality

  • Built-In Headphones: Integrated headphones or audio solutions provide immersive 3D sound.
  • Spatial Audio: Advanced audio systems that simulate realistic sound positioning and depth, enhancing immersion.

5. Input and Control

  • Controllers: Ergonomic and responsive controllers with precise tracking are crucial for interacting with the virtual environment.
  • Hand Tracking: Some headsets offer hand tracking technology, allowing for more natural and intuitive interactions without controllers.

6. Compatibility and Content Library

  • Platform Support: Ensure the headset is compatible with your preferred gaming platform (PC, console, standalone).
  • Content Availability: Access to a diverse and extensive library of VR games and applications is essential for a fulfilling experience.

7. Performance and Hardware Requirements

  • Standalone vs. Tethered: Standalone headsets have built-in processors and storage, offering wireless freedom, while tethered headsets rely on a connected PC or console for power, often delivering higher performance.
  • PC Specifications: For tethered headsets, ensure your PC meets the recommended specifications to avoid performance issues.

8. Battery Life

  • Usage Time: For standalone headsets, battery life is crucial. Look for models that offer several hours of continuous use.
  • Charging Time: Quick charging capabilities and replaceable batteries can minimize downtime.

9. Price and Value

  • Budget: Determine your budget and compare headsets within that range, considering the balance of features, performance, and build quality.
  • Longevity: Investing in a high-quality headset that will remain relevant and supported for years to come can offer better long-term value.

10. Additional Features

  • Adjustable Lenses: Some headsets offer adjustable lenses to accommodate users with glasses or different vision needs.
  • Customizability: Look for headsets that offer customization options such as replaceable face pads or additional accessories.

By considering these key features, you can select a VR headset that meets your needs and enhances your virtual reality experience, providing the best combination of immersion, comfort, and performance.

Comparing Standalone vs. Tethered VR Headsets

Choosing between a standalone and a tethered VR headset depends on your specific needs and preferences. Both types of headsets have their advantages and drawbacks, and understanding these can help you make an informed decision. Here’s a detailed comparison to guide you:

Standalone VR Headsets

Advantages:

  1. Wireless Freedom:
    • Standalone VR headsets do not require a connection to a PC or console, allowing for unrestricted movement. This wireless experience enhances immersion and is convenient for various applications.
  2. Ease of Use:
    • These headsets are often easier to set up and use, making them ideal for beginners. Simply turn on the device, and you’re ready to go.
  3. Portability:
    • Standalone VR headsets are highly portable. You can take them anywhere without worrying about additional equipment, cables, or setting up external sensors.
  4. Integrated Hardware:
    • Equipped with built-in processors, storage, and sensors, standalone headsets offer a self-contained VR experience. This integration can lead to a more streamlined and user-friendly experience.
  5. All-in-One Design:
    • Many standalone headsets come with built-in speakers and microphones, providing a complete VR experience without the need for additional peripherals.

Disadvantages:

  1. Performance Limitations:
    • Standalone headsets generally have less powerful hardware compared to tethered headsets connected to high-performance PCs or consoles. This can result in lower graphics quality and processing power.
  2. Battery Life:
    • These headsets rely on battery power, which limits the duration of continuous use. Users may need to recharge frequently, especially during extended sessions.
  3. Content Availability:
    • While improving, the content library for standalone headsets may be smaller compared to the extensive libraries available for PC or console-based systems.

Tethered VR Headsets

Advantages:

  1. Superior Performance:
    • Tethered VR headsets benefit from the power of the connected PC or console. This results in higher resolution, better graphics, and smoother performance, providing a more immersive experience.
  2. Extensive Content Library:
    • Access to a wide range of VR content through platforms like SteamVR, Oculus Store, and PlayStation VR. This extensive library includes high-quality games, applications, and experiences.
  3. Enhanced Tracking:
    • Many tethered headsets use external sensors or base stations for more precise tracking, resulting in more accurate and responsive movement within the virtual environment.
  4. Longer Usage Sessions:
    • Since they do not rely on battery power, tethered headsets can be used for extended periods without worrying about recharging.

Disadvantages:

  1. Limited Mobility:
    • The need to be connected to a PC or console via cables restricts movement, which can be cumbersome and limit the immersive experience.
  2. Complex Setup:
    • Tethered headsets often require more complex setup procedures, including positioning external sensors and managing cables, which can be daunting for new users.
  3. Less Portable:
    • The dependency on a PC or console makes tethered headsets less portable and more challenging to transport compared to standalone models.
  4. Higher Cost:
    • The total cost of ownership can be higher, considering the need for a high-performance PC or console to run the headset effectively.
  • Standalone VR Headsets are ideal for users seeking portability, ease of use, and wireless freedom. They are suitable for casual gamers, VR newcomers, and those who value convenience over top-tier performance.
  • Tethered VR Headsets are perfect for enthusiasts and professionals who prioritize performance, graphics quality, and a wide range of content. They are best for users who don’t mind a more complex setup and restricted mobility in exchange for a superior VR experience.

Ultimately, the choice between standalone and tethered VR headsets depends on your specific use cases, preferences, and budget. Both types of headsets offer unique benefits that can cater to different aspects of the VR experience.

VR Headsets for Gaming: Top Picks and Performance

As the realm of virtual reality gaming continueO0s to expand, selecting the right VR headset becomes crucial for achieving the ultimate immersive experience. Here, we present our top picks for VR headsets specifically designed for gaming, highlighting their key features and performance metrics.

1. Meta Quest 3

Key Features:

Meta Quest 3 512GB— Breakthrough Mixed Reality — Powerful Performance — Asgard’s Wrath 2 and Meta Quest+ Bundle

  • Standalone System: No PC or console required, offering complete wireless freedom.
  • Display: High-resolution LCD with up to 120Hz refresh rate.
  • Processor: Custom Sna0pdragon XR2, ensuring smooth gameplay.
  • Content: Extensive library through the Oculus Store, including exclusive titles.
  • Comfort: Lightweight design with adjustable straps and comfortable padding.

Performance: Meta Quest 3 provides an impressive standalone VR experience with solid performance and high-quality visuals. Its wireless nature makes it highly convenient for casual and mobile gamers. However, it may not match the graphics fidelity and performance of high-end tethered systems.

2. Valve Index

Key Features:

Valve Index VR Full Kit

  • Tethered System: Requires a powerful gaming PC.
  • Display: Dual LCD screens with a combined resolution of 2880×1600 and a 144Hz refresh rate.
  • Tracking: Uses external base stations for precise motion tracking.
  • Controllers: Advanced “knuckles” controllers for enhanced interaction.
  • Comfort: High-quality build with adjustable fit and ergonomic design.

Performance: Valve Index is renowned for its superior tracking accuracy and visual fidelity, making it a top choice for serious gamers. Its high refresh rate and resolution deliver smooth and detailed visuals, while the advanced controllers enhance gameplay interactivity.

3. Sony PlayStation VR2

Sony PlayStation VR2 Headset and Controllers - White (Renewed)

Key Features:

  • Tethered System: Designed for PlayStation 5.
  • Display: OLED screens with a resolution of 2000×2040 per eye and up to 120Hz refresh rate.
  • Tracking: Inside-out tracking with integrated cameras.
  • Exclusive Titles: Access to a range of exclusive PlayStation VR games.
  • Haptic Feedback: Innovative haptic feedback and adaptive triggers.

Performance: PlayStation VR2 offers an exceptional VR gaming experience tailored for PS5 users. Its high-quality display and advanced tracking provide immersive visuals and accurate motion sensing, while exclusive titles and haptic feedback enhance gameplay depth.

4. HTC Vive Pro 2

Key Features:

HTC VIVE Pro 2 Virtual Reality System

  • Tethered System: Requires a VR-ready PC.
  • Display: 5K resolution (2448×2448 per eye) with a 120Hz refresh rate.
  • Tracking: External base stations for precise tracking.
  • Audio: Integrated high-resolution audio.
  • Comfort: Ergonomic design with adjustable straps and padding.

Performance: HTC Vive Pro 2 is a high-end VR headset known for its outstanding display quality and precise tracking. It delivers ultra-sharp visuals and smooth performance, making it ideal for gamers seeking the best possible VR experience.

5. HP Reverb G2

Key Features:

HP Reverb G2 VR Headset With Controller, Adjustable Lenses & Speakers from Valve, 2160 x 2160 LCD Panels, For Gaming, Ergonomic Design, 4 Cameras, Compatible With SteamVR & Windows Mixed Reality

  • Tethered System: Compatible with both SteamVR and Windows Mixed Reality.
  • Display: 2160×2160 per eye resolution with a 90Hz refresh rate.
  • Audio: High-quality spatial audio.
  • Comfort: Lightweight design with adjustable straps and memory foam padding.
  • Ease of Use: Simple setup with inside-out tracking.

Performance: HP Reverb G2 strikes a balance between high resolution and ease of use. Its exceptional visual clarity and comfortable design make it a solid choice for both casual and serious gamers, though its tracking may not be as precise as systems with external sensors.

VR for Work and Education: Best Headsets for Productivity

Virtual Reality (VR) is revolutionizing not just gaming but also work and education by providing immersive and interactive environments for various professional and academic applications. Here, we explore the best VR headsets designed to enhance productivity, collaboration, and learning.

1. Oculus Quest 2

Key Features:

Oculus Quest 2 Advanced All-in-One Virtual Reality Gmaing VR Headset 128GB Set, White

  • Standalone System: No PC required, offering complete wireless freedom.
  • Display: High-resolution LCD with 1832×1920 pixels per eye.
  • Processor: Qualcomm Snapdragon XR2, ensuring smooth performance.
  • Ease of Use: Simple setup with an intuitive interface.
  • Content: Access to a wide range of productivity and educational apps.

Productivity and Educational Use: The Oculus Quest 2 is a versatile and user-friendly headset ideal for virtual meetings, training simulations, and educational programs. Its wireless capability and extensive content library make it a convenient choice for both remote work and interactive learning environments.

2. HTC Vive Focus 3

Key Features:

HTC VIVE Focus 3 Business Virtual Reality Headset

  • Standalone System: High-performance without the need for a PC.
  • Display: 5K resolution (2448×2448 pixels per eye) with a 90Hz refresh rate.
  • Processor: Qualcomm Snapdragon XR2.
  • Comfort: Ergonomic design with balanced weight distribution.
  • Enterprise Features: Dedicated business applications and robust security.

Productivity and Educational Use: The HTC Vive Focus 3 offers top-tier performance and visual clarity, making it suitable for high-end business applications, virtual collaboration, and detailed educational simulations. Its enterprise features cater to professional environments, ensuring security and scalability.

3. HP Reverb G2 Omnicept Edition

Key Features:

HP Reverb G2 VR Headset With Controller, Adjustable Lenses & Speakers from Valve, 2160 x 2160 LCD Panels, For Gaming, Ergonomic Design, 4 Cameras, Compatible With SteamVR & Windows Mixed Reality

  • Tethered System: Requires a VR-ready PC.
  • Display: 2160×2160 pixels per eye with a 90Hz refresh rate.
  • Sensors: Integrated eye tracking, heart rate sensor, and face camera.
  • Comfort: Lightweight design with comfortable padding.
  • Content: Compatible with Windows Mixed Reality and SteamVR platforms.

Productivity and Educational Use: The HP Reverb G2 Omnicept Edition is designed for nuanced professional applications, such as advanced training, detailed simulations, and remote collaboration. Its biometric sensors provide real-time feedback, making it invaluable for interactive learning and productivity analysis.

4. Varjo XR-3

Key Features:

  • Tethered System: Requires a high-performance PC.
  • Display: Dual 2880×2720 pixels per eye with human-eye resolution.
  • Tracking: Advanced eye and hand tracking.
  • Mixed Reality: Combines VR and AR capabilities for versatile use.
  • Enterprise Features: Tailored for professional and industrial applications.

Productivity and Educational Use: The Varjo XR-3 is a premium headset offering unparalleled visual fidelity and advanced tracking, ideal for high-stakes professional environments such as design, engineering, and medical training. Its mixed reality capabilities allow for seamless integration of virtual and real-world elements, enhancing collaborative and educational experiences.

5. Microsoft HoloLens 2

Key Features:

  • Standalone System: Fully integrated AR headset.
  • Display: 2K 3:2 light engines with holographic resolution.
  • Tracking: Eye and hand tracking with spatial mapping.
  • Comfort: Lightweight with a balanced design for extended use.
  • Enterprise Applications: Robust suite of business and educational apps.

Productivity and Educational Use: While technically an augmented reality (AR) headset, the Microsoft HoloLens 2 is included for its powerful applications in work and education. It enables hands-free interaction with digital content overlaying the real world, making it perfect for tasks such as remote assistance, immersive learning, and collaborative design.

Verdict

The integration of VR into work and education is transforming how we collaborate, learn, and perform professional tasks. Each of these headsets brings unique strengths to the table:

  • Oculus Quest 2: Ideal for general use, providing wireless freedom and ease of access to a variety of apps.
  • HTC Vive Focus 3: Suited for enterprise use with robust performance and security features.
  • HP Reverb G2 Omnicept Edition: Perfect for advanced simulations and biometric feedback applications.
  • Varjo XR-3: Offers unmatched visual fidelity and mixed reality capabilities for high-end professional environments.
  • Microsoft HoloLens 2: Excels in augmented reality applications, enhancing hands-on learning and remote collaboration.

Selecting the right VR headset depends on your specific needs and the nature of your professional or educational activities. These top picks ensure that you can find the perfect balance of performance, usability, and features to boost productivity and enrich lear

Tips for Setting Up and Maintaining Your VR Headset

Setting up and maintaining your VR headset properly is essential for ensuring optimal performance and longevity. Here are some tips to help you get started and keep your VR experience smooth and enjoyable:

Setting Up Your VR Headset

Clear Space for Movement: Ensure you have enough room to move around freely without obstacles. VR experiences often require physical movement, so a clear play area is essential for safety and immersion.

Setup and Calibration: Follow the manufacturer’s setup instructions carefully. This typically involves placing sensors or setting up base stations in optimal positions for tracking. Ensure they are securely mounted and pointed correctly for accurate tracking.

Adjusting Headset Fit: Properly fit the headset to your head for comfort and clarity. Adjust straps and padding to ensure a snug but not tight fit. This helps prevent discomfort during extended use and ensures the display is correctly aligned with your eyes.

Connectivity Check: Whether using a standalone or tethered headset, ensure all cables are securely connected to both the headset and the PC or console. Check for any software updates or firmware upgrades to ensure compatibility and performance improvements.

Using Your VR Headset

Take Breaks: VR experiences can be immersive, but they can also be physically and mentally intense. Take regular breaks to rest your eyes and prevent motion sickness, especially during extended sessions.

Cleanliness: Keep your headset and controllers clean to prevent dirt and oil buildup. Use a microfiber cloth to gently wipe the lenses and sensors. Avoid using harsh chemicals or abrasive materials that could damage the headset.

Environmental Awareness: Be aware of your surroundings while immersed in VR. Ensure there are no objects or obstacles in your play area that could cause injury or damage when moving around.

Maintaining Your Virtual Reality VR Headset

Storage: When not in use, store your VR headset in a clean, dry place away from direct sunlight and extreme temperatures. Use the provided case or a dedicated storage solution to protect it from dust and accidental damage.

Software Updates: Regularly check for software updates for both your headset and associated applications. Updates often include performance enhancements, bug fixes, and new features that can improve your VR experience.

Controller Maintenance: Clean and inspect your VR controllers regularly. Replace batteries as needed and ensure buttons and sensors are functioning correctly. Store controllers in a safe place to prevent accidental damage.

Lens Protection: When not in use, keep the lenses covered with lens protectors or the provided lens cover to prevent scratches and dust buildup. Handle the headset with care to avoid touching the lenses directly.

Troubleshooting Tips

Calibration Issues: If experiencing tracking or calibration problems, recalibrate your headset according to the manufacturer’s instructions. Ensure adequate lighting in your play area and adjust sensor positions if necessary.

Performance Optimization: If your VR experience feels sluggish or laggy, close unnecessary background applications on your PC or console. Adjust graphics settings within VR applications to balance performance and visual quality.

Comfort Adjustments: Experiment with different padding or accessories to enhance comfort, especially if you wear glasses. Adjust IPD (interpupillary distance) settings if available to align the lenses with your eyes for better clarity.

By following these tips for setup, usage, maintenance, and troubleshooting, you can maximize the lifespan of your VR headset and ensure a consistently enjoyable and immersive virtual reality experience.

Conclusion

Setting up and maintaining your VR headset is essential for maximizing your virtual reality experience. By following proper setup procedures, adhering to usage guidelines, and implementing regular maintenance practices, you can ensure optimal performance, longevity, and safety. Taking care to clean and store your headset properly, staying updated with software upgrades, and troubleshooting issues promptly will not only enhance your VR sessions but also protect your investment in this advanced technology. These efforts contribute to a more immersive, enjoyable, and sustainable VR experience for users across various applications and environments.

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